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Full text of "The manufacture and properties of iron and steel"

THE  HISTOEY AND SHAPE OF THE TEST-PIECE.
315
TABLE XVI-a
Test-Pieces; from Rolled Flats, and from f-inch Bounds of the Same Heats Rolled from a 14-inch Square Ingot.
m
1,1 "edge of bar; 2,2-
rounds cut on a machine; 8r- center of bar; 4*-54-inch round rolled from an ingot.
'•p.	$ •"§.*	i rat'	•O •-£				«	! *
umber- of grou	Lmits of iiltimi strength in group, of the 5 i.nch roundrol from the ingot pounds per sqliare inch.	umber of heat Ln group.	lace fromwhie test was taken see head of tab	It. strength pounds per — square inch.	lastic limit; pounds per square inch.	lastic ratio; percent.	00"*?' ' ri . "15-|I : IS i-H'H	eduction of ar< percent.
fc	^ .	• ' ™	fc  .	P	w.	W	H	
			. •• • 1 '	57450	85085	61.1	28.50	61.97
' " T			2	67095	81575	66.8	27.87	. 54.48 •
:l     '			8	, 66990	88185	68.2	25.18	48.89
			•  4 '	59463	48489	78.1	27.90	68.01
			1	61586	86677	69.6	26.78	48.60
			•- • -2	60712	84572	66.9	26.82	58.22
			8	60870	84512	67.2	26.66	44.86
			4	64461	48872	68.1	26.17	. 60.67
	• ...		1	68816	88988	fli.2	26.72	51.02
-.; III	to	8	2 . 8	64480 62955	85940 87892	65.8 60.2	27.87. 26.88	54.48 46.69
„			4 •	70541	47045	66.7	24.61	49.96
plates the difference is not as marked, on account of the effect of cross-rolling."
''•'• I believe these differences, will be less in plates rolled from a' slab than in those made directly from an ingot. In any event, plates can be made by the first method .which exhibit practically ihe same properties in both directions. This will be shown by •Table XVI-E, which gives the averages of 100 plates rolled from Pennsylvania Steel Company slabs. The total number of plates was 104; of these, one was rejected on account of gauge, and three on account of tensile strength. No plate was thrown out for' deficient- ductility, although an elongation of 25 per cent, in 8 inches was required in both longitudinal and transverse strips, 'both these tests being madp on each separate plate. The thickness varied from one-half incli to three-quarter... inch, and the--width from'.53 injshes to-'87 inches. . The steel was basic open-Kearth, _with an average "composition as'follows: Carbon, 0.17 per cent, j